Don Coppersmith
Cryptologia
A new algorithm for computing Hadamard transforms is presented. If n is a power of four, then the new algorithm uses ⅞ n logn multiply/adds to compute a Hadamard transform of length n. © 1994 IEEE
Don Coppersmith
Cryptologia
Ephraim Feig, Shmuel Winograd
Linear Algebra and Its Applications
Elliot Linzer
Linear Algebra and Its Applications
Don Coppersmith, Alan J. Hoffman
Linear Algebra and Its Applications